Navajo weaving Shiprock Storm Pattern by Sally Hulley. Storm Pattern weavings are not designed around a central diamond pattern, but maybe the center is a Navajo hogan, a lake, or the center of the universe, the corner elements are said to be the four sacred mountains, the four winds, or the four cardinal directions. The zigzag lines are usually called lightning lines or thunder. The characters at both ends are called water bugs or pinon beetles. All of these elements come together to call in the rains which are always part of ceremonies, prayers and a big blessing in the SW. Measures 37 by 51 inches.